| 摘要 |
The present invention relates to a drill structure. Two chip discharge units formed in a spiral shape are installed at a blade unit. The two chip discharge units are separated from a drill tip towards a handle unit and are gradually connected or the two chip discharge units are overlapped from the drill tip towards the handle unit. The two chip discharge units have a first depth and a second depth. The depth variation of the first depth and the second depth facing the handle unit from the drill tip is different. The drill structure is capable of improving drill efficiency. |
